package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    private static final String JSCODE_URL="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    UserMapper userMapper;
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //1.调用微信官方接口  获取微信的openid（微信的位移标识）
        Map<String,String> paramMap = new HashMap<>();
        paramMap.put("appid","wx405e550642b404e1");
        paramMap.put("secret","361c46e8366070de0626a8e83a3a88bc");
        paramMap.put("js_code",userLoginDTO.getCode());
        paramMap.put("grant_type","authorization_code");
        String result = HttpClientUtil.doGet(JSCODE_URL, paramMap);
        //解析微信登录后的结果
        JSONObject jsonObject = JSONObject.parseObject(result);
        String openid = jsonObject.getString("openid");
        //2.判断Openid是否为Null,如果为Null,则抛异常，提示用户登录失败
        if(StringUtils.isEmpty(openid)){
            throw new LoginFailedException("微信登录失败");
        }
        //3.先查询数据库中Openid对应的用户是否存在
        User user = userMapper.getByopenId(openid);
        //4.不存在则新增用户
        if(user == null){
            user = new User();
            user.setName("微信用户");
            user.setOpenid(openid);
            user.setCreateTime(LocalDateTime.now());
            userMapper.insert(user);
        }
        //5.存在则返回用户信息
        return user;
    }
}
